Precoder Selection Method and Apparatus for Performing Hybrid Beamforming in Wireless Communication System

1. A method to receive a signal by a receiver in a wireless communication system, the method comprising: selecting candidate transmit beams of a plurality of transmit beams for respective transmit antennas based on received signal strengths using a plurality of beam pairs comprising the plurality of transmit beams for the respective transmit antennas of a transmitter and a plurality of receive beams for respective receive antennas of the receiver; estimating channel values of the channels between the candidate transmit beams for the respective transmit antennas of the transmitter and the plurality of receive beams for the respective receive antennas of the receiver; determining a transmit beam and a receive beam based on the channel values; determining a precoder vector based on the determined transmit beam and the determined receive beam; and receiving signals based on the precoder vector via the determined transmit beam and the determined receive beam from the transmitter.

2. The method of claim 1 , wherein selecting the candidate transmit beams for the respective transmit antennas comprises selecting a predetermined number of transmit beams for the respective transmit antennas in order of decreasing signal strength.

3. The method of claim 1 , wherein the determining the precoder vector comprises: determining a maximum value of the channels; determining the transmit beam and the receive beam that correspond to a channel having the maximum value; and selecting the precoder vector by matching a correlation between channel vectors that correspond to the channel and to zero.

4. The method of claim 3 , wherein the correlation corresponds to the phase value of channel values of the channel vectors transmitted from pairs of different antennas to the plurality of receive beams for the respective receive antennas.

5. The method of claim 1 , further comprising: transmitting, to the transmitter, information related to the selected precoder vector.

6. A method to transmit a signal by a transmitter in a wireless communication system, the method comprising: transmitting a reference signal for beam information determined by a receiver; receiving the beam information related to a precoder vector having a phase value calculated based on a transmit beam and a receive beam determined by the receiver; and transmitting signals based on the precoder vector via the transmit beam and receive beam to the receiver, wherein the transmit beam and the receive beam are determined based on channel values of channels between candidate transmit beams for respective transmit antennas and a plurality of receive beams for respective receive antennas of the receiver and estimated by the receiver, and wherein the candidate transmit beams for the respective transmit antennas are selected by the receiver based on signal strengths of signals received using a plurality of beam pairs comprising a plurality of transmit beams for the respective transmit antennas and the plurality of receive beams for the respective receive antennas.

7. The method of claim 6 , wherein the candidate transmit beams for the respective transmit antennas are a predetermined number of transmit beams selected in an order of decreasing signal strength.

8. The method of claim 6 , wherein the transmit beam and the receive beam corresponds to a channel having a maximum value of the channel values, and wherein the precoder vector is selected by matching a correlation between channel vectors that corresponds to the channel and to zero.

9. The method of claim 8 , wherein the correlation corresponds to the phase value of channel values of the channel vectors transmitted from pairs of different transmit antennas to the plurality of receive beams for the respective receive antennas.

10. A receiver to receive a signal, the receiver comprising: a controller configured to: select candidate transmit beams for a plurality of transmit beams of respective transmit antennas based on received signal strength using a plurality of beam pairs comprising the plurality of transmit beams for the respective transmit antennas of a transmitter and a plurality or receive beams for respective receive antennas of the receiver, estimate channel values of channels between the candidate transmit beams for the respective transmit antennas and the plurality of receive beams for the respective receive antennas of the receiver; determine a transmit beam and a receive beam based on the channel values; and determine a precoder vector based on the determined transmit beam and the determined receive beam; and a transceiver configured to receive signals based on the precoder vector via the determined transmit beam and the determined receive beam from the transmitter.

11. The receiver of claim 10 , wherein the controller is configured to select a predetermined number of transmit beams for the respective transmit antennas in order of decreasing signal strength.

12. The receiver of claim 10 , wherein the controller is configured to: determine a maximum value of the channel values; determine the transmit beam and the receive beam that correspond to the channel having the maximum value; and select the precoder vector by matching a correlation between channel vectors that correspond to the channel and to zero.

13. The receiver of claim 12 , wherein the correlation corresponds to the phase value of channel values of the channel vectors transmitted from pairs of different transmit antennas to the plurality of receive beams for the respective receive antennas.

14. The receiver of claim 10 , wherein the transceiver, under control of the controller, is configured to transmit, the transmitter, information related to the selected precoder vector.

15. A transmitter to transmit a signal, the transmitter comprising: a transmitter configured to transmit a reference signal for beam information determined by a receiver; a receiver configured to receive the beam information related to a precoder vector having a phase value calculated based on a transmit beam and a receive beam determined by the receiver; and a controller configured to control the transmitter to transmit signals based on the precoder vector via the transmit beam and the receive beam to the receiver, wherein the transmit beam and the receive beam are determined based on channel values of channel between candidate transmit beams for respective transmit antennas and a plurality of receive beams for respective receive antennas of the receiver and estimated by the receiver, and wherein the candidate transmit beams for the respective transmit antennas are selected by the receiver based on signal strengths of the signals received using a plurality of beam pairs comprising a plurality of transmit beams for the respective transmit antennas and the plurality of receive beams for the respective receive antennas.

16. The transmitter of claim 15 , wherein the candidate transmit beams for the respective transmit antennas are a predetermined number of transmit beams selected in order of decreasing signal strength.

17. The transmitter of claim 16 , wherein the transmit beam and the receive beam correspond to a channel having a maximum value of the channel values, and wherein the precoder vector is selected by matching a correlation between channel vectors that correspond to the channel and to zero.

18. The transmitter of claim 17 , where the correlation corresponds to the phase value of channel values of the channel vectors transmitted from pairs of different transmit antennas to the plurality of receive beams for the respective receive antennas.